Friction clutch



March 3, 1931. R F, DEHN Y 1,795,082

FRICTION CLUTCH Original Filed Dec. l0, 1926 anne/Hoz joy F Daim -AJabbozneq Patented Mar. 3, 1931 UNITED. STATES ROY F. DEI-IN, OFCLEVELAND, OHIO FRICTION CLUTCH Application led December 10, 1926,Serial No. 153,840, Renewed July 30, 1930.

This invention relates to friction clutches, and has for its principalobject to provide a friction clutch of such construction that the shoesthereof will exert throughout their entire contact surfaces evenlydistributed pressure thereby attaining the maximum friction or eiiciencyand the even wearing away of the entire surfaces of the shoes.

Another object of the invent-ion is to provide aifriction clutch of saidcharacter, in which the wearing away of the friction surfaces does notadect the angle of application of the' driving power relative to saidfriction surfaces.

Another object of the invention is to provide a friction clutch of saidcharacter, in which the adjustment for wear is conveniently and easilymade.

Another object lof the invention is to provide a friction clutch of saidcharacter, which is operated manually and requires very little eort onthe part of the opera-tor.

With the above and other objects in view, the invention will behereinafter fully described as illustrated inthe accompanying drawings,and the novel features thereof will be distinctly pointed out in theappended claims. v A i In the drawings similar characters of referenceindicatecorresponding parts.

Figure 1 is an elevation or end view of a friction clutch constructed inaccordance with my invention, certain parts being broken away to bettershow the construction thereof, Y

Fig. 2 is a plan sectional view taken on line 2-2 of Fig. 1,

Fig. 3 is a sectional view illustrating the ball and socket connectionsof the links with the shoes, and

Fig. 4 is a perspective view of one of the levers.

Referring to the drawings, 1 represents the power or driving shaft and 2the driven drum which is loosely mounted upon said shaft and is adaptedto transmit power. For transmitting the power from the driving shaft 1to the driven drum 2, a hub 3 is fixed to said shaft by means of a key4, and this hub has formed integrally therewith oppositely extendingtively, to permit swinging movement of said arms so as to bring theshoes ll and 12 into or out of engagement with the rim 15. An importantfeature of this invention is that the lever-arms 9 and 10 normally areon an angle extending from said pivotal points 16 and 17 to thetransverse center lines of the frictional pieces 13 and 14 of the shoes11 and 12 and the driven drum 2, and said transverse center lines are inalignment with a line at right angles to said diametrical line passingthrough the pivotal points 16 and 17 and indicated by 18.

For forcing the shoes 11 and 12 into engagement with the rim 15 of thedrum 2, f

levers 19 and 2O are pivoted at 21 and 22 respectively to oppositelydisposed lateral lugs 23 and 24E formed integrally with a collar 25,which is mounted upon the driving shaft 1. This collar is adapted toturn with said driving shaft but slide longitudinally thereupon, andthis is accomplished by utilizing the before mentioned key 4. The innerends of the levers 19 and 2O are provided with sockets as 26 forreceiving the ball ends, indicated by 27, of links 28 and 29, the otherball ends of which, indicated by 30, rest in sockets, indicated by 31,of the shoes 11 and 12. The ball ends 27 and 30 are provided withoutwardly fiared openings, as indicated at 32, for rer ceiving bolts orpins 33 and 34 for pivotally connecting said ends to the levers andshoes and yet permit sufficient free movement at these points for theproper functioning of the parts. The outer or free ends of the levers 19and 2O have oppositely curved surfaces at 35 and 36, and said ends areadjustably connected to the collar` 25 by means of stud bolts 37 and 38,which pass through openings of said levers, indicated at 39. Nuts 40 aresible for turning them in or out for properV` adj listin nt of thelevers 19 and 2O to take up the Wear on the shoes. l

l t is readily seen that in a frictional vclutch Constructed asdescribed, the frictional sur: faces of the shoesll and 1,2 are forcedevenlyy against the iin er side of the rim of the drum due to said shoesbeing anl equal lengthl at each side of the transverse diameter of thedrum indicated by 18, and said shoesbeing pivotally supported at 16 and17 bythe leverarms 9y and 1Q, Which normally extend inthe direction oflines from said pivotal points to the intersection of the transversediameter f of the drum, andthe application of the actuating power onsaid transverse diameter againstthe centers of said shoes throughv thelinks 28 and 29 by the slidingmovement of the collar 25 and the levers19 and 2O carriedk thereby. This veven Contact of the shoesfwith the rimbecause the shoes arepivotally supported at 16 andv 17 and thereforeactuated` substantially in a straight line by the links 28 and 29, givesthe maximum friction efficiency ofthe shoes, evenwearing thereof, andbut little effort is required on the part of the operator for actuatingtheclutch.

lt Will be understood that slight changes in the details of constructionmay be made Within the scope of theV claims, and also that by holdingthe drum 2 against rotation, the shoes 11 and 12 Would serve asvbrakesfor locking the shaft 1 against rotation. i

Having fully described my invention,vvhat I claim is 1. In a frictionclutch, the combination of a shaft, a drum loosely mounted on the shaft,a hub, the hub being fixed to said shaft, a collar, the collar beingrotatable with and movable longitudinally upon said shaft, shoes adaptedto engage the drum, arms extending from the transverse centers of theshoes, the.

free ends of the arms beingpivotally supported by the hub, linksengaging said shoes,

levers carried by said collar foractuatingythe.

lar, the collar being rotatable with and mova ble longitudinally uponsaid shaft, shoes .adapted to engage the drum, arms extending from theytransverse centers of the shoes, the free ends of the arms beingpivotally` supported by the hub,links engaging said shoes,

levers pivotally supported bysaid collar, the

levers having `one end engaging said links, and means for Aadjusting theother ends of said levers relative to the collar whereby thelongitudinal movement of the collar will aclevers having:one-endfengaging said links, the other endsof the levers-beingprovidedAwith openings, stud .bolts fixed inv said' collar,

and passingv throughl Saidopenings,y and: nuts upon-'said studVboltsfadaptedto engage the.

ends of said leversf el. in a friction clutch, the combination-of a.

shaft, a drum looselyf,mounted on the-shaft, a hub, the hub being ixedto said shaft, a collar, the hub having-foppositelyyexten-ding,-

arms, the collar beingjeather keyedftoithe shaft, shoes adapted Vtoengage thed-rum, the

transverse centers of the shoes beinginfa,A

plane at right V angles tothe said' arms of the hub, v lever-arms formedintegrally *.Withf said.y

slices and exten-dingfromy the 'transverse cen-v ters thereof andhavingtheir` ends 'pivotally supported by saidV arms of thehub, andmeans for actuatingithe shoes-from,- they longitudinal:

movementl of said collar:` i

5. ln a friction clutch, thecombinatiOnIOfa shaft, a drum-looselymounted on the shaft,

a hub,- the hubxbeinglixed to said shaft, acol= lar, the hub havingoppositelya extending arms, the collar'rbeingffeather r*keyed totheshaft, shoes adaptedgto engagethe fdrum, Athe transverse centers of theshoes beingrin'fa plane at right-angles tothe said arms of the hub,lever-armsfformed integrall-yvvith. said.v f

shoes and extending; from. thetransverse! centers thereof andhavingtheir vends -pivotallysupported by said arms of the hub, linksfensgagine' said shoes,-;and meanscarriedf-by-,said collar for actuating thelinks upon longitu-v dinal-movementl of thec'ollar?.Y

In testimony whereof, I afix ,mysi-gnaturea:

ROY. F. DEHN.r

